Cutting tool for slitting purposes



July 1, 11941. J. VAN UNEN CUTTING TOOL FOR SLITTI'NG PURPOSES Filed March 11, 1939 FIGB Patented July 1, 1941 CUTTING TOOL FOR SLITTEN G PURPOSES Jacob van Unen, Amsterdam, Netherlands, assignor to Werkspoor N. V., Amsterdam, Netherlands, a company of The Netherlands Application March 11, 1939, Serial No. 261,365

In the Netherlands March 17, 1938 2 Claims.

My present invention relates to a cutting tool for slitting purposes and its object is to provide a simple, efficient and inexpensive device designed for cutting and slitting paper, tracing cloth and other material.

A further object of this invention is to provide a tool so designed, shaped and constructed that it will permit a slitting operation to take place quickly and accurately along a ruler, or another guiding means, in such a manner that the knife is prevented from engaging the support for the paper or the like. I

With these and other objects in view, my invention consists in .the combination, arrangement and details of construction disclosed in the drawing and specication, and more particularly pointed out in the appended claims.

In the drawing, which is merely illustrative of my invention and wherein similar reference characters designate similar parts throughout the respective views- Fig. 1 is 'a side elevation,

Fig. 2 is a bottom view, and

Fig. 3 is a front elevation of my novel tool, this figure also showing, in cross-section, a support for the paper in addition to a ruler for guiding the tool.

A rectanglar wooden block I is provided in its centre with a screw 2, the head of which is countersunk in the left hand side wall (as seen in Fig. 3) and the opposite end of which projects from the right hand side wall. Screwed on said end is a knob-shaped nut 3, by means of which a rectangular metal clamping plate Il of slightly smaller size than said side walls is adapted to be forced towards the wooden block. Plate 4 is provided with -two pins 5 on opposite sides of the screw 2 in line therewith and adapted to enter into corresponding recesses 5a of block I.

By said means an ordinary safety razor blade 6 centered upon pins 5 can be clamped between the block I and the plate 4.

The recesses 5a. are located in a plane that makes an acute angle with the bottom face of block I, so that, when the blade 6 is clamped in, only one cutting corner thereof projects a relatively small distance below said bottom face.

Secured to the bottom face of block I as by screws 'I is a metal foot plate 8, one side edge of which is flush with the left hand side wall of block I as seen in Fig. 3, the other side edge projecting through some distance from the right hand side wall of the block. Said foot plate has a longitudinal slot extending from the front (i. e. the left hand side end as seen in Figs. 1 and 2) to la certain depth indicated by Il, thus forming an inner strip I0 and an outer strip 9, the arrangement being such that the inner edge of the outer strip 9 is flush with the inner face of clamping plate d, i. e. with the outer face of cutting blade 6.

The thickness of the plate 8 exceeds a little the depth through which the blade 6 projects below the bottom face of the wooden block I.

At the front of foot plate B, the bottom face of the inner strip EI] and the top face of the outer strip 9 are beveled.

Assuming now a sheet of paper I3 to be supported on a table or another suitable base I2, and the described tool to be placed on the table near one edge of the paper with its left hand side wall engaging a ruler I4 (Fig. 3), then movement of the tool towards said edge will cause the beveled end of strip 9 to locally raise the paper from the table, while the body portion of the paper remains below the strip I0 and is held thereby in rm engagement with the table, as clearly seen in Fig. 3.

Further movement of :the tool will bring the edge of the paper into engagement with the cutting corner of blade 6, which thus slits the paper without the base I2 and the ruler I4 being liable to damage.

What I claim is:

1. A cutting tool comprising a carrier having a bottom face, a cutting blade, means for securing said blade to said carrier at 'an angle to said bottom face and with a portion of said blade projecting below said bottom face, a strip member having a top face, a bottom face and a front face and secured to said carrier and comprising two spaced portions to define a slot in which the portion of the cutting blade projecting below the carrier extends, the bottom face of said strip member lying below said projecting portion of said blade, one of said strip member portions having the front end of its top face bevelled towards the front and being vertically spaced from that part of the tool which lies on the same side of the cutting blade as said portion, the other strip member portion having the front end of its bottom face bevelled towards the front.

2. A cutting tool comprising a carrier plate having a bottom face, a cutting blade, a clamping plate for securing said blade to said carrier plate at an angle to said bottom face and with a portion of said blade projecting below said bottom face, a strip member having a top face.

a bottom face and a front face yand secured to said carrier plate and comprising twoV spaced portions to define a slot in which the portion of the cutting blade projecting below the carrier plate extends, the bottom face of said strip member lying below said projecting portion of said blade, one of said strip member portions contacting the carrier plate and having the front end of its bottom face bevelled towards the front, the other strip member portion lying under "the clamping plate and being vertically spaced therefrom and having the front end of its top face bevelled towards the front.

JACOB VAN UNEN. 

